I understand that you are looking to resolve this vehicle issue yourself with the help of your fellow forum members and I might not be able to give any technical advice. If you cannot resolve this issue yourself ,please know that GM Customer Care is here and happy to assist. Private message if I can be of any assistance.

Well I have a 2007 Colorado having starting issues too. It had 74K on it when I bought it 6/14 and it is 9/16/14 now with 78k and I have had same problem a half of dozen times now. It cranks but not start. Happens when it is hot cold it doesn't matter. I wait 10 to 15 minutes and it will start like nothing has happened. Fuel pump works when this happens. I have read up on this on the internet and find out that I am not the lone dog on the block having this issue. I am wondering if the last guy got rid of this truck cause of this problem. I bought it from a dealer. I read passlock, fuel, spark and other reasons to look for. I call head mechanic at Chevy in Roseville, Ca auto mall. Said he has heard of this issue too but cannot nail it down. I looked for a recall. People have replaced parts to no avail spending money going back to square one. No Check engine light. My $200 Scanner does not find anything neither. I am at a loss. Can anyone help.

Now have done fuel pressure ck. 55 lbs and holds. 55 lb running. Fuel pump cks out good. Ck it before problem and also ck it while it did it again caring the pressure guage with me waiting for it to happen again. A couple of things I have also tried, seems to do better with full tank, but than did it again. Wait a few seconds for fuel pump to to build pressuer. It is happening to me quiet regularly now. Sometimes three times a day. Someone please help.